Vacuum generator



FIG. 1 is a front, top, and left side perspective view of a vacuum generator showing our new design;

FIG. 2 is a rear, bottom, and right side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a right side elevational view thereof.

The broken lines in the drawings illustrate portions of the vacuum generator that form no part of the claimed design. 

CLAIM The ornamental design for a vacuum generator, as shown and described. 